Embankment (5)
(Other definitions for ridge that I've seen before include "Narrow raised band on a surface" , "Long narrow natural elevation" , "there's a lot of pressure in it" , "Line where two upward sloping surfaces meet" , "back of whale" .)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">embankment</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for levee that I've seen before include "Flood embankment" , "Embankment holding water back" , "Riverside embankment" , "An embankment built to prevent a river from overflowing" , "Retaining embankment" .)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">embankment</span>' is the definition.<br/ ><span class="explanation-format__explanation">(wall is a kind of embankment)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for wall that I've seen before include "Brick/stone barrier" , "Brick fence" , "Barrier, internal or external" , "Stone fence" , "Dividing or protecting structure" .)